Meson-Meson-Prozesse in der starken Wechselwirkung

Janßen, G.

Book/Report

FZJ-2019-00567

Meson-Meson-Prozesse in der starken Wechselwirkung

Janßen, G. (Corresponding author)FZJ*

1995
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Berichte des Forschungszentrums Jülich 3065, 123 p. (1995)

Please use a persistent id in citations: http://hdl.handle.net/2128/21324

Report No.: Juel-3065

Abstract: Based on the meson-exchange framework the present work investigates the role played by meson-meson processes in strong interaction dynamics. We concentrate on two particular topics, one representing the more fundamental aspects of meson-meson systems the other being an example for the many possible applications. Using realistic meson-exchange models for $\pi \pi$- and $\pi \eta$-scattering the first part of this work investigates the structure of the scalar meson f$_{0}$(980) and a$_{o}$(980) both being of outstanding importance for our understanding of the scalar meson sector. Our model produces good agreement with the available data. Furthermore, an analysis of the pole structure of the underlying $\pi \pi$- and $\pi \eta$-scattering amplitudes leads to an understanding of the nature and parameters of f$_{0}$(980) and a$_{o}$(980). It is shown that besides the observed relationship between f$_{0}$(980) and a$_{o}$(980) their underlying structure is quite different. The second part of our investigation deals with the role played by correlated $\pi \rho$ exchange in the N N interaction. Starting point are open questions concerning the structure of the $\pi$ N N vertex function. In the Bonn potential of the N N interaction a rather 'hard' $\pi$ N N formfactor is required in order to be able to reproduce experimental data, in particular the deuteron properties. However, this result is in disagreement with predictions from several theoretical models requiring a much softer $\pi$ N N formfactor. We are able to show that this discrepancy is removed if correlated $\pi \rho$exchange is added to the Bonn potential.

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